Paul bitteelin



. UNIT D STATES PATENT OFFIQl-EO PAUL BITTERLIN, JR, OF PARIS, FRANCE.

COMPOUND FOR ETCHING VITREOUS SURFACES.

SPECIFICATION forming part of Letters Patent No. 254,263, dated February 28, 1882. Application filcd March 7 1881. (No specimens.) Patented in France January 2i, 1880.

To all whom it may concern:

Be it known that I, PAUL BITTERLIN, Jr., of Paris, France, have invented a 00m pound for Etching Vitreous Surfaces, of which the following is a specification.

Hydrofluoric acid is in general use for etching vitreous surfaces; but the object of my invention is to enable glass-engravers to obtain old or new effects by mixing therewith a compound which will be hereinafter described.

I mix with hydrofluoric acid a portion of any finely-divided material-such as the natural silicates, emery, &c.-which will be attacked l y it. This decreases the energy of its action, and causes it to act with more uniformity and regularity upon the vitreous surface; or, if I desire to vary the etched surface and obtain engravings of the most varying aspects, Imix therewith some'finely-divided lnaterial such PAUL BITTERLIN, JEUNE.

Witnesses LOUIS J. ALTON, PHILIP WALKER. 

